That's amazing, whenever it was made.
I don't know, really. The buttons appear to be beads? They look new as far as I can tell from your photos, but they might be replacements. Can you tell what the fibre is? eg cotton? Are there any seams? If so please show them (inside), if you can, eg what's going at the back of the yoke - is that a seam or an applique on top? How are the sleeves joined to the body? Also it'd be good to see the elasticated waist inside. I'm wondering if there's any overlocking / serging anywhere, that would indicate commercial manufacture.
If this is hand crochet (I think it must be, as I'm not aware of machines that make this kind of crochet?) it was a HUGE amount of work. Fine thread, tiny hook. I've seen this kind of work on gloves or doilies, but this is something else!
But someone may know differently, that this kind of thing can be done by machine.